Anti theft alarm



FIG. 1 is a front perspective view of an anti theft alarm, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate the portions of the anti theft alarm, which form no part of the claimed design. 

CLAIM The ornamental design for an anti theft alarm, as shown and described. 